A serious looking Rex Tillerson, Chairman and Chief Executive Officer, Exxon Mobil Corporation, listens to a Senator's question. The heads of five of the largest oil and gas companies in the world testified before the Senate Finance Committee on May 12, 2011 on Capitol Hill in Washington DC, arguing that ending tax incentives would reduce exploration, eliminate jobs and stifle economic growth while doing nothing to reduce fuel prices. Participating were executive officers of Exxon, BP America, Shell, ConocoPhillips and Chevron. (Photo by Jeff Malet)